/+.&6.
15
(1) Resonance: The same cartridges shall not be subjected to a resonance search or dwell during the
gunfire vibration due to the physical characteristics; small size and weight and the method of testing
cartridge, which is inside the vibration (cube) test fixture.
(2) Sinusoidal cycling (50 Hz to 500 Hz): The same six cartridges shall be subjected to the
sinusoidal vibration cycling at 70EF for 30 minutes in each of three axes with the frequency varying
logrithmically from 50 Hz to 500 Hz and back to 50 Hz in approximately 7.5 minutes. The test level is
shown in figure 3.
(3) Fixed dwell testing: After the initial sinusoidal cycling, the cartridges shall be subjected to a
series of fixed dwells at 70EF as shown in table V in each of the three axes. The fixed narrow band
dwells shall be performed by sweeping the frequency about ± 5% of the specific center frequency. For
example, the 100 Hz dwell should be performed from 95 Hz to 100 Hz at a logrithimic sweep rate of 7.5
minutes.
TABLE V. Gunfire vibration test schedule.
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